Sensitivity was 50–100 μV/division, sweep speed was 1 ms/division, duration of pulse was 0.1 ms, rate of pulse was 2–5/s, and the machine used was a Medelec MS 6. Low-frequency filter and high-frequency filter were not specified.
This study was performed in the supine position.
Following the orthodromic method [
1], signals were recorded using surface electrodes at the wrist, proximally to the distal wrist crease (Fig.
1). The active electrode (A) was placed proximal to the crease; the reference (R) was placed proximally. The author used conventional surface electrodes of felt (8-mm “cushions” 25 mm apart) soaked in 0.9 % saline secured by band; using bar electrodes, the distance between active and reference electrodes was fixed. Ground (G) was placed on the palm of the hand, proximal to the recording electrodes at the distal wrist crease. Each recording consisted of 5–8 superimposed traces.
This is a preview of subscription content, log in to check access.
Eklund G (1975) A new electrodiagnostic procedure for measuring sensory nerve conduction across the carpal tunnel. Ups J Med Sci 80:63–64PubMedCrossRefGoogle Scholar
Daube JR (1977) Percutaneous palmar median nerve stimulation for carpal tunnel syndrome. Electroencephalogr Clin Neurophysiol 43:139–140CrossRefGoogle Scholar
Foresti C, Quadri S, Rasella M et al (1996) Carpal tunnel syndrome: which electrodiagnostic path should we follow? A prospective study of 100 consecutive patients. Electromyogr Clin Neurophysiol 36:377–384PubMedGoogle Scholar